Air-tube for pneumatic tires.



Patented lune I7, |902.

A. T. comen.

AIR `TUBE.FOR PNEUMATIG TIRES.Vv

(Application led Apr. 15, 1902.)

(lo model.)

UNITED STATES PATENT OEEICE.

ARTHUR THOMAS COLLIER, OF ST. ALBANS, ENGLAND, ASSIGNOR OF ONE HALF TO EDGAR OLIVER GOSS AND ARNOLD ELWORTI-IY WILLIAMS, OF

LONDON, ENGLAND.

AIR-TUBE FOR PNEUMATIC TIRES.

SPECIFICATION forming part of Letters Patent No. 702,869, dated June 17, 1902.

Application filed April l5, 1902. Serial No. 103,040. (No specimens.)

To @ZZ whom it may concern:

Be it known that I, ARTHUR THOMAS GOL- LIER, a subject Of the King of Great Britain, residing at St. Albans, England, have invented certain new and useful Improvements Relating to Air-Tubes for Pneumatic Tires, of which the following is a specification.

It is well known that an india rubber tube for pneumatic tires cured with salts or 1o compounds of antimony (a so-called redrubber tube) is much stronger and tougher than a rubber tube cured with sulfur or other vulcanizing agents, (a so-called gray-rubber tube.) A rubber air-tube cured with antimonycompounds, however, possesses'the disadvantage kthat it cannot. ,be soV readily patched Or repaired when punctured asa rubber tube which does not contain antimony.

By my invention I construct an air-tube of zo several layers of rubber, the first or inner layer or layers containing antimony coinpounds and the next or outer layer or layers containing sulfur or other vulcanizing agents, the several layers being preferably produced by wrapping. The tube thus constructed is then vulcanized,and the several layers of rubber are thoroughly baked together andform one solid tube. In some cases I insert between the inner layer orlayers containing anti- 3o niony compounds and the outerlayer or layers containing sulfur or othervulcanizing agents one or more neutral layers of rubber which do not contain any vulcanizing agent Whatever. During the subsequent process of vulcanization the antimony compounds of the inner layers and the sulfur Or other vulcanizing agents of the outerlayers permeate, however, to some extent the rubber of the neutral layer or layers and sufficiently cure it.

4o The neutral layer or layers are interposed in Order to prevent the antimony compounds of the inner layers from permeating the outer layers during vulcanization and at the same time to prevent the sulfur of the outer layers from permeating the inner layers. The curing Or vulcanizing agents above referred to are employed in the manner well known in the art to which this invention relates, the antimony compound or salt being usually the pentasuld. The several layers of rubber 5o may, in addition to the vulcanizing agents mentioned above, contain any other ingredients which are usually mixed With rubber.

A rubber air-tube for pneumatic tires constructed according to myinvention combines the advantages of an antimOny-cured tube as regards toughness with the advantages of a sulfur-cured tube as regards facility of repairing and is better adapted for use in a pneumatic tire than a tube cured throughout 6o either with antimony Or With sulfur or other .vulcanizing agents.

Vhat I claim isl. In an air-tube for a pneumatic tire, the combination of an inner layer of india-rubber, cured with an antimony compound and an outer layer cured with sulfur, substantially as, and for the purpose specified.

2. In an air-tube for a pneumatic tire, the combination of an inner layer of india-rubber 7o cured with an ant-imony compound, an outer layer cured with sulfur, and an intermediate layer acted upon by the curing agents from the said inner and outer layers, substantially as, and for the purpose hereinbefore described. y

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

ARTHUR THOMAS COLLIER.

Witnesses:

GEO. HARRISON, CONRAD K. FALKENSTEIN. 

